package com.leilei.educenter.controller;

import com.google.gson.Gson;
import com.leilei.commonutils.JwtUtils;
import com.leilei.educenter.entity.UcenterMember;
import com.leilei.educenter.service.UcenterMemberService;
import com.leilei.educenter.utils.ConstantWxUtils;
import com.leilei.educenter.utils.HttpClientUtils;
import com.leilei.servicebase.exceptionhandler.GuliException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.net.URLEncoder;
import java.util.HashMap;

/**
 * @author leiguodong
 * @version 1.0
 */
@Controller   //只是请求地址，不需要返回数据
@RequestMapping("/api/ucenter/wx")
@CrossOrigin
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;



    //2 获取扫描人信息，添加数据
    @GetMapping("callback")
    public String callback(String code,String state){

        try {

            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";


            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code);


            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);
            System.out.println("accessTokenInfo=============" + accessTokenInfo);


            //解析json字符串
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);

            String accessToken = (String)mapAccessToken.get("access_token");
            String openid = (String)mapAccessToken.get("openid");


            //把扫描人信息添加数据库里面
            //判断数据库表中是否存在相同微信信息,根据openid判断
            UcenterMember member = memberService.getOpenIdMember(openid);
            if (member == null){    //表中没有相同数据，进行添加

                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";

                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        accessToken,
                        openid
                );


                String userInfo = HttpClientUtils.get(userInfoUrl);

                //解析json
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);

                String nickname = (String)userInfoMap.get("nickname");
                String headimgurl = (String)userInfoMap.get("headimgurl");

                //向数据库中插入一条记录
                member = new UcenterMember();
                member.setNickname(nickname);
                member.setOpenid(openid);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }

            //使用jwt根据menber对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());

            //最后，回到首页，通过路径传递token字符串
            return "redirect:http://localhost:3000?token="+jwtToken;

        }catch (Exception e){
            throw new GuliException(20001,"登录失败");
        }

    }


    // 1 生成微信二维码
    @GetMapping("login")
    public String getWxCode(){

        //固定地址，后面拼接参数
//        String url = "https://open.weixin.qq.com/" +
//                "connect/qrconnect?appid="+ ConstantWxUtils.WX_OPEN_APP_ID+"&response_type=code";

        // 微信开放平台授权baseUrl,%s相当于占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
        "?appid=%s" +
        "&redirect_uri=%s" +
        "&response_type=code" +
        "&scope=snsapi_login" +
        "&state=%s" +
        "#wechat_redirect";

        //对redirect_uri进行URLEncoder编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "UTF-8");
        }catch (Exception e){

            throw new GuliException(20001, e.getMessage());
        }

        //设置%s的值
        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "leilei"
        );

        //重定向到请求微信地址
        return "redirect:"+url;
    }
}


